Rotary concrete mixer



June 24, 1930. F. oRElLLY '1,767,809

` ROTARY CONCRETE MIXER l File@ sept. 12. 192e l 2 sheets-sheet 1 (D ffINVENTolg.

, Era/1ers ORez/[y ATTORNEYS.l

nulli-ll- 'June 24,1930. F. oRl-:ILLY 1,767,309

ROTARY CONCRETE MIXER Filed Sept. l2., 1928 2 Sheets-Sheet 2 ATTQRNEYS.

Patented June 24, 1930 FRANCIS oREILLY, or SAN FRANCISCO, CALIFORNIARQTABY GQNCBE'IE MIXEB Application tiled September 1:2, 192,8. SerialNo. 305,340.

rlvhis invention relates to .mixers as. used for concrete yor othermaterial and l has for its objects improvements in this type ofmachinery whereby it will form a rcompact efficient mixing unitincombination with a 'motor' truckl and operated thereby, falso such aconstruction *which will be easy to assembleand maintain, y

The drawings show the preferred form of my invention, it beingyunderstood that changes may be made within the spirit of the inventionand scope of the vvappended claims:

Fig.A 1 is aplan view ofA my improved mixer mounted on a motor truck, aportion only of the truck being fshown and the forward end of the watertank being broken away. I

Fig. 2 is a side elevation of the miXer with the front wall of themixingreceptacle or bowl and other parts broken away so as to reveal theinternal construction.

Fig.` 3. is van enlarged perspective view showing one ofthe stationarymixing arms which project downwardinto the bowl, and Shows the upper'attachment of the, arm to a boem Supportand. the lower attachment to abottom scraper-bar. A Y

Broy des'orbed Amy improved mixer comprises a vertically disposedcylindrical bowl-like receptacle `open yon ytop and mounted one-motortruck for bodily revolution by a power connection from ythe truck. y The`bottoni of the bowl. is conical or Slaatod downward toward a centraldise charge opening closed by a'large valve opening upwards. throughmoans ,of hand oontrol, whileunder lthe discharge valve a rovolrablo-ohuto adapted be vturned longitudinally with'rrojeot laterally of thevtrilolr. Chassis,

` Within th'bowl S, i.eciallyy formed stationary mixing armsl an 'bladessecnred to overhead frame.

In ,detail the' y(sono,trnot.on., comprises a motor truck the freine'oirwhioh ioatod .at 15 ro'arwhelels 2', and 'cab .3-

, ,Y .Friilly Soouro ilo-tho topof the, francis. .circular base 4 whichforms a ysupport for a series l of radial beams 5 projecting from ahub 5preferably cast integral and which beams form the support for the mixingreceptacle or bowl.

The bowl `is preferably constructed with a steel plate sidewall@ and acast bottom 6,

secured thereto, the bottom slanting downwardly to a central dischargeopening in a sleeve 1' revolvably positioned in hub 5. The outer wallof. the sleeve 7 is circumferentially groovedas at 8 and revolvablysuspended in this groove is a discharge spout 9 adapted to turn in thegroove so as to point the spout in various angles from the side of thetruck or swing to lie centrally and longitudinally under the truck.

The bowl is formed underneath with a circular track 10 resting on aplurality of idler rollers 11, one rotatably 'mounted on each of theradial beams 5, the track and idlers preferably being conical tocompensate for thesurface movements involved.

At the outer edge of the bottom is a bevel gear ring'lO engaged fordrivingv the bowl by a pinion `11 V-secured, toa shaft 12 rotatablymounted on a plate 13 bridging two of the beams 5, and which shaft isfurther geared or otherwise connected with suitable power transmissionelements as at 14 for driving by the truck motor in any of the wellunderstood ways not shown in the drawings, it .being understood that thearrangement will include av clutch someywherein the System. as at l5 forconnecting or disconnecting the mixer drive from .the engine whendesired. i

Closing the discharge opening of the bowl a` downwardly seating conicalvalve 16 suspendedV from a l,pair Aof overhead beams ing cylindricalneck 19 vslidably` fitting within af downwardly extending outer cylinder20 secured to the beams ,17,'h'the arrangement being Vsuch that thevalve seated against sleeve 7` can turn with the bowl while its neck 19will revolve within the fixed cylinder 20.

To raise and lower the valve 16, a rod 21 extends downwardly within thetubular elements 19, 20 and at its lower end rotatably engages a web 22extending inwardly of member 19, ball or plain thrust collars 23 beingarranged at both sides of the webso that the -valve 16 can freelyrevolve with respect to rod 21 whether suspended thereon or forced toits seat thereby.

Secured or attached to the upper portion of rod 21 is a square rack bar24 guided for vertical movement through a square hole in a fixed plate25, and engaging the rack is a pinion 26 mounted on a horizontal shaft27 revolvably supported in bearings 28 and provided at its outer endwith a handewheel 29 for operation to raise or lower the valve,-

a ratchet and double pawl device at 30 serving to hold the valve at any.point of openinO.

tlositioned over the valve gear is al conical or wedge-shaped roof 31adapted to defleet material into the bowl in loading the also adeflecting arm or plow 37 extending straight down from one of the beams17.

The arrangement and form of these devices is important, and, assumingthe bowl to be revolving in direction indicated by the arrow those at 32are arranged to force the material inward to heap it toward anintermediate ring in the bowl. This ring of material is split by theplow 37, the split rings are caught by the hanging loop blades 34 whichare shaped to exercise a lifting of the material as well as a sidewisespreading V"thereof toward the center Yof the bowl and the arms at 32are arranged to force the material toward'the valve 16 for dischargetherefrom if the same be open.

' Arms 32 and 32 are tied together at their lower end by bottom plows38, 38 respectively, and the angles of the arms or twist` changes towardthe upper end of the arms ends of the yarms or where they are weakest isreduced. Y

Device 36 is formedwith an angular face to act as a'plow against thevertical wallof the bowl and throw the material inward.

A water tank 39 is arranged horizontally adjacent the forward edge ofthe bowl and is cut out at a crescent as at 40 to come close to theperiphery of the bowl yet preserve the open top thereof clear for theintroduction of the load to be mixed.

This tank 39 is supported on the framing as indicated and is providedwith extra side enclosingV plates 41 extending downward to protect thedriving machineryand also make a better appearance.

The tank is filled at 42, has an air escape valve at 43, and is cut awayat 44 to provide working room for'manipulation of the valve wheel 29. Adoor 41 in one of the side plates 41 serving to make the wheelaccessible from the side of the truck.

Water may be admitted to the bowl from 1 the tankthrough one or morepipe nozzles valved as at 44, 44.

In operation, a loadof concrete or other material to be mixed isdeposited from above into the bowl, and when it is desired to mix thematerial sufficient water is run into it from the tank and the bowlrevolved by power from the engine as described, the

yvalve opened when sufficiently mixed and the load discharged.

The double pawl ratchet wheel 30, it should be noted, provides forforcing the valve downward and locking it, andthe construction at 21, 22provides for revolution of the machineV with the valve held at anydesired opening.

I claim:

1. In a mixer of the character described, an open topped bowl, providedwith a central bottomdischarge opening, means by which said bowl may bebodily revolved on a vertical axis, and means extending within said bowlarranged and adapted for mixing a load of material in the'bowl and forforcing it toward said'central opening, a conical valve seateddownwardly against said opening provided with a tubularneck extendingupward in said bowl, and means for lifting and lowering said valveextending into said neck, and a fixed tubular memberV depending intosaid bowl guiding said neck.

2. In a structure as specified 4in claim 1, the means for lifting andlowering the valve comprising a rack bar extending upwardly from thevalve, a pinion engaging the rack,

and a shaft upon which the pinion is Ymounted revolvably supported above'the bowl; y n

3. In a structure as specified in claim 1, a roof-like cover positionedover the upper end of the valve and guiding members and the means forlifting and lowering the valve.

Y 4.7In a structure as specified in claim 1, the means for lifting andlowering the valve' comprising a rack bar extending upwardly from thevalve, a pinion engaging the rack, and a shaft upon which the pinion ismounted revolvably supported above the bowl and means for locking saidshaft with valve raised or lowered to its seat.

5. In a mixer of the character described,

a bowl, the bottom of said bowl converging centrally downward andprovided with a central discharge opening, a valve arranged and adaptedfor closing said opening, and mixing devices extending into the bowlarranged and adapted for mixing a mass therein and forcing it towardsaid discharge opening, said devices including a plurality of downwardlyprojecting arms formed and arranged to force the mass toward anintermediate ring-like position in said bowl, and

a device positioned and arranged for disrupting said ring.

6. In a mixer of the character described,

a bowl, the bottom of said bowl converging centrally downward andprovided with a central discharge opening, a valve arranged and adaptedfor closing said opening, and mixing devices extending into the bowlarranged and adapted for mixing a mass therein and forcing it towardsaid discharge opening, said devices including a plurality of downwardlyprojecting arms each formed to present a varying angular surface fromtop to bottom of the bowl to material in the bowl upon revolving thebowl and arms relatively and a bottom plow secured to said arms.

7. In a mixer of the character described,

a revolvable bowl, means for revolving the bowl and means for liftingthe material in stages from the bottom toward the top of the bowlcomprising a series of curved looplike blades suspended horizontallyfrom vertically depending bars.

8. In a mixer, a revolvable bowl, and

means for mixing material therein comprising a series of curvedloop-like blades suspended horizontally from vertically depending bars.

9. In a mixer, a vertically revolvable bowl, stationary mixing means insaid bowl adapted for forcing the material to be mixed toward anintermediate position in the bowl, and stationary means arranged forspreading said layer laterally.

FRANCIS OREILLY.

